Malicious PDF — malware analysis report

Static analysis result for SHA-256 15647c50f4ed3830…

MALICIOUS

PDF

77.6 KB Created: 2021-04-02 12:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 43b16214d431c99c8d892a7ff06fb7ec SHA-1: 78f3781631fa26a37c0d4a00487e12d3e752de07 SHA-256: 15647c50f4ed383070fb9916318a1311b761d70245378ff42f3c11bafe1d134b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The document body, though heavily obfuscated, contains strings related to computer hardware, suggesting a lure to attract users to click on these links. The presence of multiple external URIs and the ML classifier's high confidence score indicate a malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xajibur.ru/strik?utm_term=dell+latitude+e7450+i7-5600u+test PDF link annotation
    • http://dezowem.medianewsonline.com/cengage_coordinate_geometry_free_download.pdfIn PDF document text
    • https://tevitoretej.weebly.com/uploads/1/3/2/6/132680933/rawiveruwibew.pdfIn PDF document text
    • https://tumunonapuve.weebly.com/uploads/1/3/1/3/131379134/nozukeranowab-ruwudavene.pdfIn PDF document text
    • https://petodudugagakot.weebly.com/uploads/1/3/4/6/134640630/3110006.pdfIn PDF document text
    • http://goromeo.club/blessed_john_henry_newman_rc_college_uniform72i6z.pdfIn PDF document text
    • http://setokanekema.mygamesonline.org/bloom_s_taxonomy_book.pdfIn PDF document text
    • http://xunopapazugatar.medianewsonline.com/32630903170.pdfIn PDF document text
    • https://kunobile.weebly.com/uploads/1/3/4/5/134517695/repasufeziwokek.pdfIn PDF document text
    • http://mixezitubut.mygamesonline.org/auditing_as_an_instrument_for_ensuring_accountability.pdfIn PDF document text
    • https://daxatuvumuna.weebly.com/uploads/1/3/4/8/134863787/xosusoto_bufuxalit.pdfIn PDF document text
    • http://donbetosstreettacos.com/prepositions_worksheet_5th_grade3x8sd.pdfIn PDF document text
    • http://cheapkeys.site/banana_bread_gamembyt0.pdfIn PDF document text
    • http://dabopoxele.getenjoyment.net/toresireledoma.pdfIn PDF document text
    • https://simisodiguguvig.weebly.com/uploads/1/3/5/3/135324772/f3bfe7b3a.pdfIn PDF document text
    • https://pabedowilopore.weebly.com/uploads/1/3/1/1/131163579/bakesixinuwobegose.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_39b992d252a547feaebf33c96f986e5e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0a53569-a760-4bba-a62d-ff04a0eef0e8/how_can_i_influence_without_authority.pdfIn PDF document text
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_35b2b7c042564888b7f509ffb72db535.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fc5b251-fe97-4c73-9624-00d410bc16be/zefusapidi.pdfIn PDF document text
    • https://6bc61794-ec17-45f1-96eb-8bed4cd57308.filesusr.com/ugd/217b8a_0e1f590241bf447f80f6ac5992188b45.pdf?index=trueIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_d6e90a0e4eec4c669c0097f14e59087e.pdf?index=trueIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_8d7fb03f39344f1fba5470d8748f833a.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 5344 bytes
SHA-256: 63d58b66f32c040b2adf48b58ad50f465bd70710f0a1192488a7cf556fcaa4d2
font_01_sfnt_off000104e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E8 10580 bytes
SHA-256: 6b276875832d82bf1d6ab5eda859edf79ed52b7021b6da8d0a27c28c38b369b1